DevTools: more efficiently dispose messages on console clear

third_party/WebKit/Source/devtools/front_end/source_frame/UISourceCodeFrame.js

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  * 1. Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *
@@ skipping 157 matching lines @@
   onTextEditorContentSet() {
     if (this._diff)
       this._diff.updateDiffMarkersImmediately();
     super.onTextEditorContentSet();
     for (var message of this._allMessages())
       this._addMessageToSource(message);
     this._decorateAllTypes();
   }
 
   /**
-   * @return {!Array<!Workspace.UISourceCode.Message>}
+   * @return {!Set<!Workspace.UISourceCode.Message>}
    */
   _allMessages() {
-    return this._persistenceBinding ?
-        this._persistenceBinding.network.messages().concat(this._persistenceBinding.fileSystem.messages()) :
-        this._uiSourceCode.messages();
+    if (this._persistenceBinding) {
+      var combinedSet = this._persistenceBinding.network.messages();
+      combinedSet.addAll(this._persistenceBinding.fileSystem.messages());
+      return combinedSet;
+    }
+    return this._uiSourceCode.messages();
   }
 
   /**
    * @override
    * @param {!Common.TextRange} oldRange
    * @param {!Common.TextRange} newRange
    */
   onTextChanged(oldRange, newRange) {
     if (this._diff)
       this._diff.updateDiffMarkersWhenPossible();
@@ skipping 484 matching lines @@
 
 /**
  * @param {!Workspace.UISourceCode.Message} a
  * @param {!Workspace.UISourceCode.Message} b
  * @return {number}
  */
 Workspace.UISourceCode.Message.messageLevelComparator = function(a, b) {
   return Workspace.UISourceCode.Message._messageLevelPriority[a.level()] -
       Workspace.UISourceCode.Message._messageLevelPriority[b.level()];
 };